flag

3. noun, slang The grade of F on something. You better study hard or you'll get a flag on this exam.

4. noun, slang A bandana worn to show one's gang affiliation. What color flag is that kid wearing?

flag down

To wave one's arms to attract someone's attention, usually to get them to stop moving. A noun or pronoun can be used between "flag" and "down." I was finally able to flag down a passing motorist to help with our stalled car.It'll take awhile to flag a taxi down. Why don't we just walk to the museum?

flag someone or something down

flag down

Signal to stop, as in The police were flagging down all cars. This expression uses the verb flag in the sense of "catch the attention of, as by waving a flag," a usage dating from the mid-1800s; down was added in the first half of the 1900s.

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